First generation will probably be helpful in law school applications,so be sure to mention that.
I think that you’re making a mistake by not considering a year out. Harvard and Yale could be yours for the asking (more or less) with a 4.0/172 and a year off. Plus a year off could be very helpful to anyone; I went straight from college to law school and was not as prepared for interviews and “the real world” as my classmates who took time off.
Another poster named Demosthenes will likely post that only GPA and LSAT matter. That’s Demosthenes’ view, based on Internet “scattergrams” that actually show that GPA and LSAT aren’t the only things that matter; a year off is increasingly important in law school admissions these days. Don’t waste your amazing GPA/LSAT numbers by not doing other things that will help ensure admission most anywhere.